There has been a few studies of the acoustic properties of the structure. There is plenty of evidence the blue stone was used for it's reverberation properties. And the whole arrangement was designed to project sound down the main approach to the henge

Stonehenge: First residents from west Wales...Stonehenge: First residents from west Wales2 Aug.`18 - Researchers have shown that cremated humans at Stonehenge were from the same region of Wales as the stones used in construction.

The key question was to understand the geographic origin of the people buried at Stonehenge. The key innovation was finding that high temperatures of cremation can crystallise a skull, locking in the chemical signal of its origin. The findings have been published in the journal Scientific Reports. The first long-term residents of Stonehenge, along with the first stones, arrived about 5,000 years ago.

Why does it matter?

While it is already known that the "bluestones" that were first used to build Stonehenge were transported from 150 miles (240 km) away in modern-day Pembrokeshire, almost nothing is known about the people involved. The scientists' work shows that both people and materials were moving between the regions and that, for some of these people, the move was permanent.

​

When their lives ended, their cremated remains were placed under the ancient monument in what is now Wiltshire. Lead author Dr Christophe Snoeck compared the levels of different forms, or isotopes, of the element strontium against a national database to work out where the cremated individuals spent the last years of their lives.

Click to expand...

Strontium is present in many bedrocks. And different geographical areas have distinctive strontium signatures. So by matching the strontium "fingerprints" in human remains to the strontium profiles of different geographical regions, a person's place of origin can be roughly determined. Dr Snoeck, who is now an international expert in cremation following a PhD at the University of Oxford, said that "about 40% of the cremated individuals did not spend their later lives on the Wessex chalk where their remains were found."

A recent study ( Olalde et al. 2018 ) found out about the genetic identity of the ancient Celts who built Megalithic tombs. It was British Neolithic farmers who were genetically similar to Neolithic Iberians, carrying Y haplogroups such as I2a and G2, which suggests that British Neolithic farmers had Iberian ancestry. The Neolithic farmer ancestry in Britain came from the Mediterranean rather than the Danubian route of farming expansion, which was derived from migrants who spread along the Atlantic coast. However, the spread of the Beaker people (R1b) to Britain from the continent around 2500 BC replaced 90% of Britain’s Neolithic gene pool within a few hundred years.

British Neolithic farmers were genetically similar to contemporary populations in continental Europe and in particular to Neolithic Iberians, suggesting that a portion of the farmer ancestry in Britain came from the Mediterranean rather than the Danubian route of farming expansion. As previously described2, there is genetic affinity to Iberian Early Neolithic farmers in Iberian Middle Neolithic/Copper Age populations, but not in central and northern European Neolithic populations. Our results suggest that a portion of the ancestry of the Neolithic farmers of Britain was derived from migrants who spread along the Atlantic coast. Megalithic tombs document substantial interaction along the Atlantic façade of Europe, and our results are consistent with such interactions reflecting movements of people. More data from southern Britain (where our sampling is sparse) and nearby regions in continental Europe will be needed to fully understand the complex interactions between Britain and the continent in the Neolithic43 .https://www.nature.com/articles/nature25738